package com.steve.netty.http;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.*;

import java.net.URI;
import java.nio.charset.StandardCharsets;

/**
 * @Author: STEVE
 * @Description: SimpleChannelInboundHandler是ChannelInboundHandlerAdapter
 * HttpObject客户端和服务器端相互通讯的数据被封装成HttpObject
 * @since: 2025-07-18
 */
public class TestHttpServerHandler extends SimpleChannelInboundHandler<HttpObject> {

    /**
     * 读取客户端数据
     *
     * @param ctx
     * @param msg
     * @throws Exception
     */
    @Override
    protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {
        // 判断msg是不是httpRequest请求
        if (msg instanceof HttpRequest) {
            System.out.println("pipeline hashcode" + ctx.pipeline().hashCode() + " TestHttpServerHandler hash=" + this.hashCode());
            System.out.println("msg 类型=" + msg.getClass());
            System.out.println("客户端地址" + ctx.channel().remoteAddress());

            HttpRequest httpRequest = (HttpRequest) msg;
            // 获取uri，过滤指定的资源
            URI uri = new URI(httpRequest.uri());
            if ("/favicon.ico".equals(uri.getPath())) {
                System.out.println("请求了 favicon.ico 不做响应");
                return;
            }
            // 回复信息给浏览器【http协议】
            ByteBuf content = Unpooled.copiedBuffer("hello，我是服务器", StandardCharsets.UTF_8);

            // 构造一个http的响应
            DefaultFullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK, content);

            response.headers().set(HttpHeaderNames.CONTENT_TYPE, "text/plain");
            response.headers().set(HttpHeaderNames.CONTENT_LENGTH, content.readableBytes());

            // 将构建好的response返回
            ctx.writeAndFlush(response);
        }

    }

}
